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BS EN IEC 61757-2-1:2021

BS EN IEC 61757-2-1:2021

$167.15

Fibre optic sensors – Temperature measurement. Temperature sensors based on fibre Bragg gratings

Published By Publication Date Number of Pages
BSI 2021 44
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PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
9 FOREWORD
11 INTRODUCTION
12 1 Scope
2 Normative references
3 Terms, definitions, abbreviated terms and symbols of quantities
13 3.1 Terms and definitions
16 3.2 Abbreviated terms
17 3.3 Symbols of quantities
18 4 Design and characteristics of an FBG temperature sensor
4.1 Fibre Bragg grating (FBG)
4.2 Dependence of Bragg wavelength on temperature
19 4.3 Design features
5 Performance parameters
20 6 Test apparatuses for performance parameter determination
6.1 Temperature calibration equipment
Table 1 – Calibration bath fluids
21 6.2 Optical spectrum analyzer and interrogator
6.3 Broadband light source
7 Test procedures of performance parameters
7.1 Sample preparation and test set-up
22 7.2 Bragg wavelength λBref
7.2.1 Measuring procedure
Figures
Figure 1 – Principal test set-up for FBG
23 7.2.2 Evaluation
7.2.3 Reporting
7.3 FBG peak spectral width
7.3.1 Measuring procedure
7.3.2 Evaluation
7.3.3 Reporting
7.4 FBG reflectivity
7.4.1 Measuring procedure
7.4.2 Evaluation
24 7.4.3 Reporting
7.5 Side-lobe suppression ratio
7.5.1 Measuring procedure
Figure 2 – Determination of the FBG reflectivity from the reflectionspectrum (left) and transmission spectrum (right)
25 7.5.2 Evaluation
7.5.3 Reporting
Figure 3 – Side-lobes in the case of a single FBG temperature sensor
26 7.6 Signal-to-noise ratio
7.6.1 Measuring procedure
7.6.2 Evaluation
7.6.3 Reporting
Figure 4 – Signal-to-noise ratio determination
27 7.7 Characteristic curve
7.7.1 Measuring procedure
28 7.7.2 Evaluation
29 Figure 5 – Example of a polynomial fit of calibration points λB,i(TN,i)
30 Figure 6 – Example of a third-order polynomial fit
31 Figure 7 – Example of a fourth-order polynomial fit
32 7.7.3 Reporting
Figure 8 – Example of a polynomial fit of the sensitivity
33 7.8 Thermal time constant
7.8.1 Measuring procedure
7.8.2 Evaluation
7.8.3 Reporting
Figure 9 – Typical response time curve
34 7.9 Sensor stability
7.9.1 Measuring procedure
7.9.2 Evaluation
7.9.3 Reporting
35 Annex A (informative)Blank detail specification
A.1 General
A.2 Mechanical and optical set-up
A.3 Operational characteristics
36 A.4 Limiting parameters
A.5 Further information given upon request
37 Annex B (informative)Examples of specific temperature calibration equipment
B.1 Simple liquid bath
Figure B.1 – Schematic representation of a simple liquid bath [3]
38 B.2 Liquid tube-thermostat
Figure B.2 – Schematic representation of liquid calibrationdevice for connection to laboratory liquid thermostats [4]
39 B.3 Solid-state calibration equipment
Figure B.3 – Schematic representation ofa long-tube fluid calibration device [3]
40 Figure B.4 – Schematic representation of a solid-statecalibration device for higher temperatures [4]
41 Figure B.5 – Schematic representation of a dry-block calibrator forcalibrating an FBG temperature sensor at higher temperatures
42 Annex C (informative)Contributions to measurement uncertainty
43 Bibliography

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